# Relationship history for MSHA mine 3601908

Current hierarchy: **Showers Gregory S → S & S Anthracite Inc → Little Vein Slope**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** M A D Coal Company → Little Vein Slope; 1950-01-01 to 1984-04-04; source msha-controller-operator-history
- **controller_controls_mine:** Morgan Alvin → Little Vein Slope; 1950-01-01 to 1984-04-04; source msha-controller-operator-history
- **controller_controls_operator:** Morgan Alvin → M A D Coal Company; 1950-01-01 to 1984-04-04; source msha-controller-operator-history
- **controller_controls_mine:** Showers Gregory S → Little Vein Slope; 1981-04-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** S & S Anthracite Inc → Little Vein Slope; 1984-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Showers Gregory S → S & S Anthracite Inc; 1984-04-05 to current/open; source msha-controller-operator-history